export function addClass(el,className){
    if(hasClass(el,className)){
        return;
    }
    let newClass=el.className.split('')
    newClass.push(className);
    el.className=newClass.join('');
}
export function hasClass(el, className){
    let reg=new RegExp('(^|\\s)'+className+'(\\s|s)');
    return reg.test(el.className)
}

export function getData(el,name,val){
    const prefix='data-'
    name=prefix+name;
    if(val){
        return el.setAttribute(name,val)
        
    }else{
        return el.getAttribute(name)
    }
}